// The MIT License (MIT)
//
// Copyright (c) 2022 Firebase
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// SOFTWARE.

import { expect } from "chai";
import * as change from "../../src/common/change";

describe("Change", () => {
  describe("applyFieldMask", () => {
    const after = {
      foo: "bar",
      num: 2,
      obj: {
        a: 1,
        b: 2,
      },
    };

    it("should handle deleted values", () => {
      const sparseBefore = { baz: "qux" };
      const fieldMask = "baz";
      expect(change.applyFieldMask(sparseBefore, after, fieldMask)).to.deep.equal({
        foo: "bar",
        num: 2,
        obj: {
          a: 1,
          b: 2,
        },
        baz: "qux",
      });
    });

    it("should handle created values", () => {
      const sparseBefore = {};
      const fieldMask = "num,obj.a";
      expect(change.applyFieldMask(sparseBefore, after, fieldMask)).to.deep.equal({
        foo: "bar",
        obj: {
          b: 2,
        },
      });
    });

    it("should handle mutated values", () => {
      const sparseBefore = {
        num: 3,
        obj: {
          a: 3,
        },
      };
      const fieldMask = "num,obj.a";
      expect(change.applyFieldMask(sparseBefore, after, fieldMask)).to.deep.equal({
        foo: "bar",
        num: 3,
        obj: {
          a: 3,
          b: 2,
        },
      });
    });
  });

  describe("fromJSON", () => {
    it("should create a Change object with a `before` and `after`", () => {
      const created = change.Change.fromJSON<any>({
        before: { foo: "bar" },
        after: { foo: "faz" },
      });
      expect(created instanceof change.Change).to.equal(true);
      expect(created.before).to.deep.equal({ foo: "bar" });
      expect(created.after).to.deep.equal({ foo: "faz" });
    });

    it("should apply the customizer function to `before` and `after`", () => {
      function customizer<T>(input: any) {
        input.another = "value";
        return input as T;
      }
      const created = change.Change.fromJSON<object>(
        {
          before: { foo: "bar" },
          after: { foo: "faz" },
        },
        customizer
      );
      expect(created.before).to.deep.equal({
        foo: "bar",
        another: "value",
      });
      expect(created.after).to.deep.equal({
        foo: "faz",
        another: "value",
      });
    });
  });
});
